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Reagents and conditions: (i) 2‐bromobenzylamine, NEt3, THF, RT; (ii) iron powder, NH4Cl, valeraldehyde, 2‐BuOH, air, reflux; (iii) but‐3‐en‐2‐ol, Pd(OAc)2, NEt3, DMA, 130 °C; (iv) mCPBA, CH2Cl2, reflux; (v) I.) benzoyl isocyanate, CH2Cl2, reflux; II.) NaOMe, MeOH, reflux.
